메타데이터
| 항목 |
값 |
| Designation |
P/2018 H2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-01-23T11:01:35.495040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:43Z |
| Obs used |
169 |
| NEO |
- |
| M1 |
17.000 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-04-16T12:40:08.832000Z |
| Discovery magnitude (MPC) |
19.90 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-04-26.0000000 |
| e |
0.54004634 |
| q (au) |
2.027090 |
| a (au) |
4.407161 |
| i (deg) |
7.388853 |
| Ω (om, deg) |
68.455880 |
| ω (w, deg) |
120.229629 |
| M (ma, deg) |
9.858205 |
밝기
산란 + 전체 선형
$$
M_a = (18.598 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
18.598 |
| n |
2.000 |
| gf |
0.982 |
| gb |
-0.786 |
| k |
0.949 |
| δ90 |
8.021 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
07:44:38.21 |
+24:59:57.5 |
HIP 37989 |
35.21 |
| 2026-07-29 12:00 |
07:45:33.30 |
+24:58:14.2 |
HIP 37989 |
22.67 |
| 2026-07-30 00:00 |
07:46:28.44 |
+24:56:29.7 |
HIP 37989 |
10.31 |
| 2026-07-30 12:00 |
07:47:23.60 |
+24:54:44.0 |
HIP 37989 |
4.10 |
| 2026-07-31 00:00 |
07:48:18.81 |
+24:52:57.3 |
HIP 37989 |
15.71 |
| 2026-07-31 12:00 |
07:49:14.05 |
+24:51:09.4 |
HIP 38172 |
21.86 |
| 2026-08-01 00:00 |
07:50:09.33 |
+24:49:20.5 |
HIP 38312 |
20.47 |
| 2026-08-01 12:00 |
07:51:04.64 |
+24:47:30.4 |
HIP 38385 |
9.98 |
| 2026-08-02 00:00 |
07:51:59.99 |
+24:45:39.1 |
HIP 38385 |
4.52 |
| 2026-08-02 12:00 |
07:52:55.37 |
+24:43:46.8 |
HIP 38385 |
16.25 |
| 2026-08-03 00:00 |
07:53:50.78 |
+24:41:53.3 |
HIP 38385 |
28.84 |
| 2026-08-03 12:00 |
07:54:46.23 |
+24:39:58.8 |
HIP 38752 |
17.10 |
| 2026-08-04 00:00 |
07:55:41.71 |
+24:38:03.1 |
HIP 38753 |
4.88 |
| 2026-08-04 12:00 |
07:56:37.23 |
+24:36:06.2 |
HIP 38753 |
8.76 |
| 2026-08-05 00:00 |
07:57:32.77 |
+24:34:08.3 |
HIP 38753 |
21.36 |
| 2026-08-05 12:00 |
07:58:28.35 |
+24:32:09.2 |
HIP 39022 |
15.77 |
| 2026-08-06 00:00 |
07:59:23.96 |
+24:30:09.0 |
HIP 39022 |
12.02 |
| 2026-08-06 12:00 |
08:00:19.61 |
+24:28:07.7 |
HIP 39022 |
19.21 |
| 2026-08-07 00:00 |
08:01:15.28 |
+24:26:05.3 |
HIP 39387 |
27.41 |
| 2026-08-07 12:00 |
08:02:10.98 |
+24:24:01.8 |
HIP 39387 |
17.35 |
| 2026-08-08 00:00 |
08:03:06.71 |
+24:21:57.1 |
HIP 39387 |
13.44 |
| 2026-08-08 12:00 |
08:04:02.48 |
+24:19:51.4 |
HIP 39528 |
9.18 |
| 2026-08-09 00:00 |
08:04:58.27 |
+24:17:44.5 |
HIP 39528 |
4.09 |
| 2026-08-09 12:00 |
08:05:54.09 |
+24:15:36.5 |
HIP 39686 |
11.90 |
| 2026-08-10 00:00 |
08:06:49.93 |
+24:13:27.4 |
HIP 39686 |
5.51 |
| 2026-08-10 12:00 |
08:07:45.80 |
+24:11:17.2 |
HIP 39790 |
10.27 |
| 2026-08-11 00:00 |
08:08:41.70 |
+24:09:05.9 |
HIP 39790 |
14.03 |
| 2026-08-11 12:00 |
08:09:37.63 |
+24:06:53.5 |
HIP 39790 |
24.97 |
| 2026-08-12 00:00 |
08:10:33.58 |
+24:04:40.0 |
HIP 40120 |
17.24 |
| 2026-08-12 12:00 |
08:11:29.55 |
+24:02:25.4 |
HIP 40120 |
10.37 |
| 2026-08-13 00:00 |
08:12:25.55 |
+24:00:09.7 |
HIP 40120 |
15.96 |
| 2026-08-13 12:00 |
08:13:21.57 |
+23:57:52.9 |
HIP 40120 |
27.20 |
| 2026-08-14 00:00 |
08:14:17.61 |
+23:55:35.0 |
HIP 40421 |
15.93 |
| 2026-08-14 12:00 |
08:15:13.68 |
+23:53:16.0 |
HIP 40421 |
8.51 |
| 2026-08-15 00:00 |
08:16:09.76 |
+23:50:55.9 |
HIP 40421 |
15.19 |
| 2026-08-15 12:00 |
08:17:05.87 |
+23:48:34.8 |
HIP 40421 |
27.00 |
| 2026-08-16 00:00 |
08:18:01.99 |
+23:46:12.5 |
HIP 40833 |
27.27 |
| 2026-08-16 12:00 |
08:18:58.14 |
+23:43:49.2 |
HIP 40833 |
15.09 |
| 2026-08-17 00:00 |
08:19:54.31 |
+23:41:24.8 |
HIP 40833 |
7.30 |
| 2026-08-17 12:00 |
08:20:50.49 |
+23:38:59.3 |
HIP 40833 |
14.88 |
| 2026-08-18 00:00 |
08:21:46.70 |
+23:36:32.8 |
HIP 41133 |
24.40 |
| 2026-08-18 12:00 |
08:22:42.92 |
+23:34:05.2 |
HIP 41133 |
11.28 |
| 2026-08-19 00:00 |
08:23:39.16 |
+23:31:36.5 |
HIP 41133 |
1.85 |